Camera optical lens

ABSTRACT

The present disclosure relates to optical lens, and provides a camera optical lens including from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.90; and 0.25≤(R15+R16)/(R15−R16)≤0.90. The camera optical lens can achieve good optical performance while meeting design requirements for a long focal length and ultra-thinness.

TECHNICAL FIELD

The present disclosure relates to optical lens, particularly, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors and PC lenses.

BACKGROUND

With an emergence of smart phones in recent years, a demand for miniature camera lens is increasing day by day. However, in general, photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor). As a progress of semiconductor manufacturing technology makes a pixel size of the photosensitive devices become smaller, in addition to a current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece, four-piece, or even five-piece or six-piece lens structure. However, with a development of technology and an increase of diverse demands of users, as a pixel area of the photosensitive devices is becoming smaller and smaller and a requirement of the system on the imaging quality is improving constantly, an eight-piece lens structure gradually appears in lens designs. Although a typical eight-piece lens already has a good optical performance, its refractive power, lens spacing and lens shape remain unreasonable to some extent, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for a long focal length and ultra-thinness.

SUMMARY

Some embodiments of the present disclosure provide a camera optical lens. The camera optical lens includes from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.90; and 0.25≤(R15+R16/(R15−R16)≤0.90, where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens.

As an improvement, the camera optical lens satisfies the following condition: 1.50≤d10/d11≤3.00, where d10 denotes an on-axis distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.46≤f1/f≤1.51; −3.28≤(R1+R2)/(R1−R2)≤−1.05; and 0.03≤d1/TTL≤0.11, where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of an object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens satisfies the following conditions: 1.77≤(R3+R4)/(R3−R4)≤14.98; and 0.01≤d3/TTL≤0.05, where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.57≤f3/f≤1.86; −3.79≤(R5+R6)/(R5−R6)≤−0.95; and 0.05≤d5/TTL≤0.15, where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens satisfies the following conditions: −2.98≤f4/f≤−0.52; −2.18≤(R7+R8)/(R7−R8)≤−0.31; and 0.01≤d7/TTL≤0.15; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.73≤f5/f≤8.19; −46.43≤(R9+R10)/(R9−R10)≤−1.64; and 0.02≤d9/TTL≤0.08; where f5 denotes a focal length of the fifth lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens satisfies the following conditions: −287.10≤f6/f≤37.43; −140.11≤(R11+R12)/(R11−R12)≤41.33; and 0.02≤d11/TTL≤0.08; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.77≤f7/f≤4.87; 1.44≤(R13+R14)/(R13−R14)≤8.15; and 0.03≤d13/TTL≤0.15; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens satisfies the following conditions: −1.78≤f8/f≤−0.41; and 0.02≤d15/TTL≤0.10; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate technical solutions according to embodiments of the present disclosure more clearly, accompanying drawings for describing the embodiments are introduced briefly in the following. Apparently, accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make objectives, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a schematic diagram of a structure of a camera optical lens 10 of Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, the sixth lens L6 has a negative refractive power, the seventh lens L7 has a positive power and the eighth lens L8 has a negative refractive power. It should be appreciated that, in other embodiments, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have other refractive powers than that of this embodiment. In this embodiment, the first lens L1 has a positive refractive power, which facilitates improving performance of the camera optical lens 10.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other materials.

In this embodiment, a total optical length from the object side surface of the first lens L1 to an image surface Si of the camera optical lens 10 along an optical axis is defined as TTL, a focal length of the camera optical lens 10 is defined as f, a focal length of the second lens L2 is defined as f2, a central curvature radius of an object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of an image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies the following condition: 0.95≤f/TTL (1); −4.00≤f2/f≤−1.90 (2); and 0.25≤(R15+R16)/(R15−R16)≤0.90 (3).

The condition (1) specifies a ratio of the focal length of the camera optical lens 10 to the total optical length of the camera optical lens 10. When the condition (1) is satisfied, given the same total optical length TTL, the camera optical lens 10 has a longer focal length.

The condition (2) specifies a ratio of the focal length f2 of the second lens L2 to the focal length f of the camera optical lens 10, which can effectively balance a spherical aberration and a field curvature of the camera optical lens 10.

The condition (3) specifies a shape of the eighth lens L8. Within this condition (3), a deflection degree of the light passing through the lens can be alleviated, and an aberration can be effectively reduced.

An on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6 is defined as d10, and an on-axis thickness of the sixth lens is defined as d11. The camera optical lens 10 satisfies the following condition: 1.50≤d10/d11≤3.00, which specifies a ratio of the on-axis distance d10 from an image-side surface of the fifth lens L5 to an object-side surface of the sixth L6 to the on-axis thickness d11 of the sixth lens L6. Within this condition, the total optical length of the camera optical lens 10 can be compressed, and ultra-thinness can be realized.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens is defined as f1. The camera optical lens 10 satisfies the following condition: 0.46≤f1/f≤1.51, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. Within this condition, the first lens L1 has an appropriate positive refractive power, the correction of the aberration of the camera optical lens 10 is facilitated, and the development of the lenses towards ultra-thinness is facilitated. Preferably, the camera optical lens 10 satisfies the following condition: 0.73≤f1/f≤1.21.

A central curvature radius of an object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies the following condition: −3.28≤(R1+R2)/(R1−R2)≤−1.05. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens. Preferably, the camera optical lens 10 satisfies the following condition: −2.05≤(R1+R2)/(R1−R2)≤−1.31.

An on-axis thickness of the first lens L1 is defined as d1, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d1/TTL≤0.11. Within this condition, ultra-thinness can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.05≤d1/TTL≤0.08.

In this embodiment, the second lens L2 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

A central curvature radius of the object-side surface of the second lens L2 is defined as R3, and a central curvature radius of the image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies the following condition: 1.77≤(R3+R4)/(R3−R4)≤14.98, which specifies a shape of the second lens L2. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the on-axis chromatic aberration. Preferably, the camera optical lens 10 satisfies the following condition: 2.83≤(R3+R4)/(R3−R4)≤11.99.

An on-axis thickness of the second lens L2 is defines as d3, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.01≤d3/TTL≤0.05. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.02≤d3/TTL≤0.04.

In this embodiment, the third lens L3 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 satisfies the following condition: 0.57≤f3/f≤1.86. With a reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 0.91≤f3/f≤1.49.

A central curvature radius of an object-side surface of the third lens is defined as R5; a central curvature radius of an image-side surface of the third lens is defined as R6. The camera optical lens 10 satisfies the following condition: −3.79≤(R5+R6)/(R5−R6)≤−0.95, which can effectively control a shape of the third lens L3 and is better for the shaping of the third lens L3. Within this condition, a deflection degree of the light passing through the lens can be alleviated, and an aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies the following condition: −2.37≤(R5+R6)/(R5−R6)≤−1.19.

An on-axis thickness of the third lens L3 is defined as d5 the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.05≤d5/TTL≤0.15. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.07≤d5/TTL≤0.12.

In this embodiment, the fourth lens L4 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

A focal length of the camera optical lens 10 is defined as f, a focal length of the fourth lens is defined as f4. The camera optical lens 10 satisfies the following condition: −2.98≤f4/f≤−0.52. With a reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.86≤f4/f≤−0.65.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of the image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies the following condition: −2.18≤(R7+R8)/(R7−R8)≤−0.31, which specifies a shape of the fourth lens L4. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −1.36≤(R7+R8)/(R7−R8)≤−0.39.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.01≤d7/TTL≤0.15. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.02≤d7/TTL≤0.12.

In this embodiment, the fifth lens L5 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 satisfies the following condition: 0.73≤f5/f≤8.19, which specifies the fifth lens L5 so as to make a light angle of the camera optical lens 10 to be gentle and reduce tolerance sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 1.17≤f5/f≤6.55.

A central curvature radius of an object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of an image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies the following condition: −46.43≤(R9+R10)/(R9−R10)≤−1.64, which specifies a shape of the sixth lens L5. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −29.02≤(R9+R10)/(R9−R10)≤−2.05.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d9/TTL≤0.08. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d9/TTL≤0.06.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 satisfies the following condition: −287.10≤f6/f≤37.43. With a reasonable distribution of the focal power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −179.44≤f6/f≤29.94.

A central curvature radius of the object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of the image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies the following condition: −140.11≤(R11+R12)/(R11−R12)≤41.33, which specifies a shape of the sixth lens L6. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −87.57≤(R11+R12)/(R11−R12)≤33.06.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d11/TTL≤0.08. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d11/TTL≤0.07.

In this embodiment, the seventh lens L7 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies the following condition: 0.77≤f7/f≤4.87. With a reasonable distribution of the focal power, the system has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 1.23≤f7/f≤3.90.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies the following condition: 1.44≤(R13+R14)/(R13−R14)≤8.15, which specifies a shape of the seventh lens L7. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: 2.31≤(R13+R14)/(R13−R14)≤6.52.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d13/TTL≤0.15. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies the following condition: 0.05≤d13/TTL≤0.12.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies the following condition: −1.78≤f8/f≤−0.41. With a reasonable distribution of the focal power, the system has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.11≤f8/f≤−0.51.

An on-axis thickness of the eighth lens L8 is defined as d15 and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d15/TTL≤0.10. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.02≤d15/TTL≤0.08.

In this embodiment, an image height of the camera optical lens 10 is defined as IH, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies the following condition: f/IH≥2.50, which facilitates achieving a long focal length of the camera optical lens 10.

In this embodiment, the image height of the camera optical lens 10 is defined as IH, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: TTL/IH≤2.92, which facilitates ultra-thinness of the camera optical lens 10.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, and a combined focal length of the first lens L1 and of the second lens L2 is defined as f12. The camera optical lens 10 satisfies the following condition: 0.62≤f12/f≤2.36. Within this condition, the aberration and distortion of the camera optical lens 10 can be eliminated and a back focal length of the camera optical lens is reduced, thereby maintaining miniaturization of the camera optical lens. Preferably, the camera optical lens 10 satisfies the following condition: 0.99≤f12/f≤1.89.

It should be appreciated that, in other embodiments, configuration of the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-discussed embodiment.

When the above relationships are satisfied, the camera optical lens 10 meets the design requirements of a long focal length and ultra-thinness while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object side surface of the first lens L1 to the image surface Si of the camera optical lens along the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

Preferably, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of each lens, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd νd S1 ∞ d0= −0.476 R1 3.292 d1= 0.615 nd1 1.5444 ν1 55.82 R2 14.743 d2= 0.130 R3 12.888 d3= 0.300 nd2 1.6610 ν2 20.53 R4 7.206 d4= 0.216 R5 4.118 d5= 0.798 nd3 1.5444 ν3 55.82 R6 14.112 d6= 0.730 R7 −6.102 d7= 0.882 nd4 1.6400 ν4 23.54 R8 25.827 d8= 0.140 R9 3.251 d9= 0.278 nd5 1.5661 ν5 37.71 R10 4.771 d10= 0.834 R11 −8.528 d11= 0.375 nd6 1.5444 ν6 55.82 R12 −8.775 d12= 0.377 R13 −8.707 d13= 0.835 nd7 1.6610 ν7 20.53 R14 −5.288 d14= 0.573 R15 −15.091 d15= 0.379 nd8 1.5346 ν8 55.69 R16 4.508 d16= 0.300 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.779

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the first lens L1;

R2: central curvature radius of the image-side surface of the first lens L1;

R3: central curvature radius of the object-side surface of the second lens L2;

R4: central curvature radius of the image-side surface of the second lens L2;

R5: central curvature radius of the object-side surface of the third lens L3;

R6: central curvature radius of the image-side surface of the third lens L3;

R7: central curvature radius of the object-side surface of the fourth lens L4;

R8: central curvature radius of the image-side surface of the fourth lens L4;

R9: central curvature radius of the object-side surface of the fifth lens L5;

R10: central curvature radius of the image-side surface of the fifth lens L5;

R11: central curvature radius of the object-side surface of the sixth lens L6;

R12: central curvature radius of the image-side surface of the sixth lens L6;

R13: central curvature radius of the object-side surface of the seventh lens L7;

R14: central curvature radius of the image-side surface of the seventh lens L7;

R15: central curvature radius of the object-side surface of the eighth lens L8;

R16: central curvature radius of the image-side surface of the eighth lens L8;

R17: central curvature radius of an object-side surface of the optical filter GF;

R18: central curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6F;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filter GF to the image surface Si;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

nd2: refractive index of the d line of the second lens L2;

nd3: refractive index of the d line of the third lens L3;

nd4: refractive index of the d line of the fourth lens L4;

nd5: refractive index of the d line of the fifth lens L5;

nd6: refractive index of the d line of the sixth lens L6;

nd7: refractive index of the d line of the seventh lens L7;

nd8: refractive index of the d line of the eighth lens L8;

ndg: refractive index of the d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −9.5591E−02 −1.6703E−03   1.0701E−03 −5.8354E−04   2.7144E−04 −2.1830E−04 R2  5.6179E+01 −9.5153E−03   1.9247E−02 −2.4821E−02   1.9483E−02 −9.2190E−03 R3 −3.4218E+00 −4.1037E−03   1.9440E−02 −3.7595E−02   3.7228E−02 −2.1160E−02 R4 −5.1984E−01 5.4268E−03 −9.3902E−04 −2.0538E−02   3.2231E−02 −2.3482E−02 R5  6.7998E−01 2.7978E−03 −7.8501E−03 −4.2642E−04   1.0543E−02 −9.9770E−03 R6 −4.1931E+01 −8.8226E−03  −3.8874E−03 3.2551E−03  1.0036E−03 −1.9625E−03 R7  3.9117E+00 4.4421E−03 −1.0711E−02 9.8218E−03 −4.8574E−03  1.1766E−03 R8 −5.9416E+01 −2.5339E−03  −1.8746E−02 3.2042E−02 −2.8723E−02  1.5983E−02 R9 −1.8781E+01 2.8006E−02 −7.4441E−02 8.2071E−02 −5.9637E−02  2.7629E−02 R10 −2.4603E+01 8.6013E−03 −2.7407E−02 2.2362E−02 −4.2587E−03 −8.0751E−03 R11  2.0958E+01 2.2882E−02 −4.0187E−02 2.9974E−02 −1.5056E−02  5.7580E−03 R12  1.6621E+01 4.0790E−02 −6.5045E−02 3.7870E−02 −8.0471E−03 −3.7337E−03 R13  1.4964E+01 1.6331E−02 −4.8791E−02 2.7089E−02 −1.3295E−02  8.0940E−03 R14  3.6523E+00 1.5399E−02 −2.6351E−02 1.0313E−02 −1.9228E−03  1.9550E−04 R15  2.6027E+01 −4.5113E−02   1.0425E−02 −6.2915E−03   4.7172E−03 −1.8500E−03 R16 −2.9264E+01 −3.2287E−02   5.3662E−03 −9.5009E−05  −1.0583E−04 −3.3906E−06 Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −9.5591E−02 1.9685E−04 −9.5016E−05 2.2133E−05 −2.0541E−06 R2  5.6179E+01 2.6833E−03 −4.9272E−04 5.7772E−05 −3.7563E−06 R3 −3.4218E+00 7.2337E−03 −1.4811E−03 1.7014E−04 −8.6650E−06 R4 −5.1984E−01 9.7676E−03 −2.3958E−03 3.2501E−04 −1.8924E−05 R5  6.7998E−01 4.7672E−03 −1.3094E−03 1.9708E−04 −1.2769E−05 R6 −4.1931E+01 1.1339E−03 −3.4594E−04 5.1478E−05 −2.9097E−06 R7  3.9117E+00 1.6007E−04 −2.3908E−04 7.0411E−05 −7.0728E−06 R8 −5.9416E+01 −5.2851E−03   8.7011E−04 −2.9298E−05  −5.8945E−06 R9 −1.8781E+01 −6.4397E−03   8.1105E−05 2.6090E−04 −3.6262E−05 R10 −2.4603E+01 8.8978E−03 −4.0400E−03 8.8601E−04 −7.6747E−05 R11  2.0958E+01 −3.0675E−03   1.5963E−03 −4.6002E−04   5.1969E−05 R12  1.6621E+01 2.7562E−03 −6.3968E−04 4.7641E−05  1.2311E−06 R13  1.4964E+01 −4.4185E−03   1.4985E−03 −2.6983E−04   1.9808E−05 R14  3.6523E+00 −5.7713E−05   2.1879E−05 −3.5503E−06   2.0939E−07 R15  2.6027E+01 3.9861E−04 −4.8410E−05 3.1272E−06 −8.3986E−08 R16 −2.9264E+01 6.1558E−06 −1.0934E−06 8.6439E−08 −2.7253E−09

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (4)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (4). However, the present disclosure is not limited to the aspheric polynomials form shown in the formula (4).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 according to Embodiment 1. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refer to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refer to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 1 1.755 / / P1R2 1 1.685 / / P2R1 1 1.775 / / P2R2 0 / / / P3R1 1 1.735 / / P3R2 3 0.725 1.125 1.445 P4R1 0 / / / P4R2 3 0.655 1.065 1.285 P5R1 3 0.855 1.155 1.635 P5R2 0 / / / P6R1 2 1.705 1.795 / P6R2 1 1.885 / / P7R1 1 1.905 / / P7R2 1 2.225 / / P8R1 2 2.085 2.665 / P8R2 1 0.605 / /

TABLE 4 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 1 1.625 P4R1 0 / P4R2 1 1.585 P5R1 0 / P5R2 0 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 0 / P8R1 0 / P8R2 1 1.215

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 10, respectively. FIG. 4 illustrates a field curvature and a distortion with a wavelength of 555 nm after passing the camera optical lens 10. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

In the subsequent Table 13, various parameters of Embodiments 1, 2 and 3 and values corresponding to the parameters specified in the above conditions are shown.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 3.479 mm, an image height of 1.0H is 3.000 mm, and a field of view (FOV) in a diagonal direction is 40.00°. Thus, the camera optical lens 10 achieves a long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences are listed below

Embodiment 2 provides a camera optical lens 20 structurally shown in FIG. 5. The sixth lens L6 has a positive refractive power. The fourth lens L4 includes an image-side surface being convex in the paraxial region.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd νd S1 ∞ d0= −0.443 R1 3.222 d1= 0.566 nd1 1.5444 ν1 55.82 R2 14.507 d2= 0.140 R3 6.177 d3= 0.232 nd2 1.6610 ν2 20.53 R4 3.818 d4= 0.377 R5 3.701 d5= 0.841 nd3 1.5444 ν3 55.82 R6 11.952 d6= 0.791 R7 −7.416 d7= 0.730 nd4 1.6400 ν4 23.54 R8 −171.152 d8= 0.070 R9 2.866 d9= 0.271 nd5 1.5661 ν5 37.71 R10 3.124 d10= 0.811 R11 −10.151 d11= 0.452 nd6 1.5444 ν6 55.82 R12 −9.440 d12= 0.377 R13 −8.57 d13= 0.567 nd7 1.6610 ν7 20.53 R14 −5.906 d14= 0.884 R15 −10.404 d15= 0.258 nd8 1.5346 ν8 55.69 R16 6.189 d16= 0.300 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.599

Table 6 shows aspheric surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −2.3194E−01  −1.8567E−03 −3.4157E−04 2.5147E−04  1.6182E−05 −1.8348E−04  R2 5.3684E+01 −1.5928E−03 −5.7468E−03 1.0821E−02 −1.0308E−02 6.0341E−03 R3 −2.3344E+00   3.4026E−03 −1.4340E−02 2.3846E−02 −2.2421E−02 1.3326E−02 R4 −7.5307E−01   2.0653E−03 −1.2786E−02 2.0219E−02 −1.8265E−02 1.0613E−02 R5 6.6764E−01 −4.1869E−03 −1.8521E−03 4.1317E−03 −1.9467E−03 4.7956E−04 R6 −2.1710E+01  −1.1861E−02 −1.1701E−03 3.2850E−03 −1.4315E−03 6.7900E−04 R7 2.0403E+00  7.3425E−03 −1.4947E−02 1.5492E−02 −1.2528E−02 9.1153E−03 R8 9.9000E+01 −1.5389E−02 −1.3733E−03 2.2436E−02 −3.8363E−02 3.6198E−02 R9 −1.8708E+01   1.3113E−02 −9.2820E−02 1.3725E−01 −1.4319E−01 1.0173E−01 R10 −2.3474E+01   4.4379E−02 −1.0829E−01 1.4039E−01 −1.2894E−01 8.3137E−02 R11 2.5143E+01  5.7089E−03 −2.7819E−02 1.7127E−02 −4.8787E−03 −6.4715E−04  R12 1.7009E+01  1.6467E−02 −4.3560E−02 2.5173E−02 −7.0227E−03 −1.6067E−04  R13 1.7057E+01 −7.2850E−03 −3.3362E−02 1.9667E−02 −1.0867E−02 6.6712E−03 R14 4.6907E+00 −1.0219E−02 −1.5074E−02 8.0531E−03 −3.1932E−03 1.1980E−03 R15 1.3755E+01 −6.6382E−02  3.0467E−02 −1.2079E−02   3.9728E−03 −9.0775E−04  R16 −3.7809E+01  −5.4015E−02  2.5998E−02 −1.0655E−02   3.3552E−03 −7.7525E−04  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −2.3194E−01   1.6644E−04 −7.1167E−05   1.5883E−05 −1.4661E−06  R2 5.3684E+01 −2.2278E−03 5.0463E−04 −6.2599E−05 3.0412E−06 R3 −2.3344E+00  −5.1140E−03 1.2404E−03 −1.7404E−04 1.0727E−05 R4 −7.5307E−01  −3.9752E−03 9.3381E−04 −1.2807E−04 7.9649E−06 R5 6.6764E−01  1.1151E−04 −1.1674E−04   3.0088E−05 −2.7667E−06  R6 −2.1710E+01  −2.7163E−04 8.0981E−05 −1.8778E−05 1.9253E−06 R7 2.0403E+00 −4.9573E−03 1.7135E−03 −3.3699E−04 2.8567E−05 R8 9.9000E+01 −2.0188E−02 6.6761E−03 −1.2181E−03 9.4475E−05 R9 −1.8708E+01  −4.6176E−02 1.2801E−02 −1.9742E−03 1.2850E−04 R10 −2.3474E+01  −3.5225E−02 9.3024E−03 −1.3869E−03 8.8743E−05 R11 2.5143E+01  3.1185E−04 2.8679E−04 −1.6280E−04 2.3446E−05 R12 1.7009E+01  5.3815E−04 −7.2593E−05  −1.5141E−05 3.2477E−06 R13 1.7057E+01 −3.2596E−03 9.9360E−04 −1.6727E−04 1.2013E−05 R14 4.6907E+00 −3.7333E−04 7.6564E−05 −8.8231E−06 4.4008E−07 R15 1.3755E+01  1.2786E−04 −9.3858E−06   2.1530E−07 5.9265E−09 R16 −3.7809E+01   1.2421E−04 −1.2933E−05   7.8557E−07 −2.1077E−08 

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 0 / / / P1R2 0 / / / P2R1 1 1.665 / / P2R2 1 1.655 / / P3R1 1 1.795 / / P3R2 3 0.815 0.995 1.545 P4R1 0 / / / P4R2 3 1.185 1.495 1.705 P5R1 1 0.665 / / P5R2 3 0.915 1.005 1.735 P6R1 1 1.715 / / P6R2 1 1.885 / / P7R1 1 1.895 / / P7R2 1 2.175 / / P8R1 2 2.015 2.585 / P8R2 3 0.495 2.615 2.665

TABLE 8 Number(s) of arrest points Arrest point position 1 P1R1 0 / P1R2 0 / P2R1 0 / P2R2 0 / P3R1 0 / P3R2 1 1.725 P4R1 0 / P4R2 0 / P5R1 1 1.565 P5R2 0 / P6R1 0 / P6R2 0 / P7R1 0 / P7R2 0 / P8R1 0 / P8R2 1 0.975

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 20, respectively. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 20. A field curvature S in FIG. 8 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

As shown in Table 13, Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 3.367 mm, an image height of 1.0H is 3.000 mm, and a field of view (FOV) in the diagonal direction is 40.00°. Thus, the camera optical lens 20 achieves a long focal length and ultra-thinness, the on-axis and off-axis aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences are listed below.

Embodiment 3 provides a camera optical lens 30 structurally shown in FIG. 9. In this embodiment, the sixth lens has a positive refractive power.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd νd S1 ∞ d0= −0.382 R1 3.152 d1= 0.495 nd1 1.5346 ν1 55.69 R2 12.984 d2= 0.125 R3 3.764 d3= 0.210 nd2 1.6359 ν2 23.82 R4 3.079 d4= 0.301 R5 3.854 d5= 0.734 nd3 1.5346 ν3 55.69 R6 21.704 d6= 0.490 R7 −5.190 d7= 0.233 nd4 1.6359 ν4 23.82 R8 14.233 d8= 0.324 R9 3.536 d9= 0.401 nd5 1.5346 ν5 55.69 R10 8.390 d10= 1.180 R11 −9.747 d11= 0.431 nd6 1.6449 ν6 22.54 R12 −7.991 d12= 0.399 R13 −8.937 d13= 0.771 nd7 1.6701 ν7 19.39 R14 −4.336 d14= 0.037 R15 −48.072 d15= 0.505 nd8 1.5346 ν8 55.69 R16 2.610 d16= 0.300 R17 ∞ d17= 0.210 ndg 1.5168 νg 64.17 R18 ∞ d18= 0.777

Table 10 shows aspheric surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 R1 −4.0221E−01  −3.2270E−03 −1.8007E−04 2.7252E−04 −1.6604E−04 −2.4724E−04  R2 5.3081E+01 −7.1222E−03  1.1768E−02 −1.2348E−02   7.8771E−03 −3.2367E−03  R3 −8.2969E−01  −5.9694E−03  1.4948E−02 −1.3074E−02   4.7346E−03 1.6027E−03 R4 −1.0018E+00  −3.1419E−03  4.4941E−03 −1.8579E−03  −2.8230E−03 5.1780E−03 R5 1.5071E+00 −2.1137E−04 −1.3594E−03 3.2956E−03 −8.4724E−04 −2.3387E−04  R6 −9.9000E+01  −1.7081E−02 −3.7745E−03 7.2060E−03 −3.9788E−03 1.3486E−03 R7 3.3041E−01 −1.0995E−02 −6.7625E−03 3.2872E−02 −4.2609E−02 3.3797E−02 R8 7.4468E+01 −1.3138E−02 −2.3992E−03 3.2748E−02 −4.5647E−02 3.7066E−02 R9 −9.6939E+00  −2.1256E−03 −1.1200E−02 1.0138E−02 −7.0282E−03 2.1597E−03 R10 −6.9469E+01   4.8857E−03 −1.1725E−02 6.1285E−03 −1.8158E−03 −1.0736E−03  R11 2.3621E+01 −2.7820E−02 −2.1948E−02 1.8866E−02 −1.5896E−02 9.7362E−03 R12 1.3283E+01 −1.4286E−02 −3.9587E−02 3.1280E−02 −1.6297E−02 6.2335E−03 R13 1.7605E+01  2.1400E−02 −5.6338E−02 3.3138E−02 −1.3246E−02 4.6431E−03 R14 1.9571E+00  2.5750E−02 −5.3883E−02 4.0242E−02 −1.8538E−02 5.4850E−03 R15 2.2677E+02 −1.2524E−01  5.2544E−02 −4.7103E−03  −6.0949E−03 3.2660E−03 R16 −1.3702E+01  −7.2430E−02  4.6945E−02 −2.0872E−02   6.2996E−03 −1.3013E−03  Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1 −4.0221E−01   4.0945E−04 −2.2280E−04   5.6776E−05 −5.7892E−06  R2 5.3081E+01  1.0435E−03 −3.1890E−04   7.6492E−05 −9.0035E−06  R3 −8.2969E−01  −2.3922E−03 1.0138E−03 −1.9954E−04 1.5108E−05 R4 −1.0018E+00  −3.7868E−03 1.4442E−03 −2.8879E−04 2.3729E−05 R5 1.5071E+00  3.0742E−04 −1.2365E−04   2.3482E−05 −1.6537E−06  R6 −9.9000E+01  −8.9079E−05 −8.8259E−05   2.7818E−05 −2.8846E−06  R7 3.3041E−01 −1.7034E−02 5.3267E−03 −9.5427E−04 7.4858E−05 R8 7.4468E+01 −1.8513E−02 5.6860E−03 −9.8824E−04 7.2128E−05 R9 −9.6939E+00   9.4173E−04 −7.2387E−04   1.5445E−04 −1.0677E−05  R10 −6.9469E+01   1.7364E−03 −7.3122E−04   1.2901E−04 −7.6809E−06  R11 2.3621E+01 −4.3856E−03 1.3361E−03 −2.3953E−04 1.8596E−05 R12 1.3283E+01 −1.8349E−03 4.1595E−04 −6.5134E−05 5.1827E−06 R13 1.7605E+01 −1.6238E−03 4.5065E−04 −7.6344E−05 5.6583E−06 R14 1.9571E+00 −1.0554E−03 1.3046E−04 −9.8502E−06 3.6161E−07 R15 2.2677E+02 −7.8316E−04 1.0143E−04 −6.8244E−06 1.8523E−07 R16 −1.3702E+01   1.8058E−04 −1.6066E−05   8.2550E−07 −1.8579E−08 

Table 11 and Table 12 show design data of inflexion points and arrest points of each lens in the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 11 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 1 1.535 / P2R2 1 1.425 / P3R1 0 / / P3R2 2 0.455 1.235 P4R1 0 / / P4R2 0 / / P5R1 0 / / P5R2 2 0.855 1.155 P6R1 0 / / P6R2 1 1.765 / P7R1 1 1.955 / P7R2 0 / / P8R1 0 / / P8R2 1 0.605 /

TABLE 12 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 / / P1R2 0 / / P2R1 0 / / P2R2 0 / / P3R1 0 / / P3R2 2 0.805 1.455 P4R1 0 / / P4R2 0 / / P5R1 0 / / P5R2 0 / / P6R1 0 / / P6R2 0 / / P7R1 0 / / P7R2 0 / / P8R1 0 / / P8R2 1 1.625 /

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 30, respectively. FIG. 12 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 30. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows values corresponding to the conditions according to the above conditions in the embodiments. Apparently, the camera optical lens 30 in the present embodiment satisfies the above conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 3.150 mm, an image height of 1.0H is 3.000 mm, and a field of view (FOV) in the diagonal direction is 43.60°. Thus, the camera optical lens 30 achieves a long focal length and ultra-thinness, the on-axis and off-axis aberration is sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13 Parameters and Embodiment Embodiment Embodiment conditions 1 2 3 f/TTL 0.95 0.95 0.95 f2/f −3.00 −1.93 −3.97 (R15 + R16/(R15 − R16) 0.54 0.25 0.90 f 8.349 8.081 7.561 f1 7.614 7.453 7.627 f2 −25.045 −15.605 −30.015 f3 10.353 9.475 8.614 f4 −7.572 −12.042 −5.908 f5 16.820 44.137 11.074 f6 −1198.510 201.622 62.214 f7 18.398 26.253 11.667 f8 −6.428 −7.196 −4.600 f12 10.319 12.733 9.646 FNO 2.40 2.40 2.40 TTL 8.751 8.476 7.923 IH 3.000 3.000 3.000 FOV 40.00° 40.00° 43.60°

It will be understood by those of ordinary skill in the art that the embodiments described above are specific examples realizing the present disclosure, and that in practical applications, various changes may be made thereto in form and in detail without departing from the range and scope of the disclosure. 

What is claimed is:
 1. A camera optical lens comprising from an object side to an image side in sequence: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−1.90; and 0.25≤(R15+R16/(R15−R16)≤0.90; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; and R16 denotes a central curvature radius of an image-side surface of the eighth lens.
 2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following condition: 1.50≤d10/d11≤3.00; where d10 denotes an on-axis distance from the image-side surface of the fifth lens to the object-side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens.
 3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.46≤f1/f≤1.51; −3.28≤(R1+R2)/(R1−R2)≤−1.05; and 0.03≤d1/TTL≤0.11; where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of an object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.
 4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 1.77≤(R3+R4)/(R3−R4)≤14.98; and 0.01≤d3/TTL≤0.05; where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.
 5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.57≤f3/f≤1.86; −3.79≤(R5+R6)/(R5−R6)≤−0.95; and 0.05≤d5/TTL≤0.15; where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.
 6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −2.98≤f4/f≤−0.52; −2.18≤(R7+R8)/(R7−R8)≤−0.31; and 0.01≤d7/TTL≤0.15; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.
 7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.73≤f5/f≤8.19; −46.43≤(R9+R10)/(R9−R10)≤−1.64; and 0.02≤d9/TTL≤0.08; where f5 denotes a focal length of the fifth lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.
 8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −287.10≤f6/f≤37.43; −140.11≤(R11+R12)/(R11−R12)≤41.33; and 0.02≤d11/TTL≤0.08; where f6 denotes a focal length of the sixth lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.
 9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.77≤f7/f≤4.87; 1.44≤(R13+R14)/(R13−R14)≤8.15; and 0.03≤d13/TTL≤0.15; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.
 10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −1.78≤f8/f≤−0.41; and 0.02≤d15/TTL≤0.10; where f8 denotes a focal length of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens. 